4 Troubleshooting
4-2
4-2 Checkpoints by Error Mode
4-2-1 No Power
Does proper DC 14V/5V
appear at Pin 3. Pin 9 of
CN100?
Check connector Pin3, Pin9 in
I/P Board.
Yes
No
No
No
No
No
Does proper DC A5V
appear at FT144?
Check IC101 and IC105.
Yes
Does proper B3.3V
appear at Pin 2 of IC111?
Check IC102.
Yes
Does proper DC B1.8V
appear at Pin 4 of Q802,
Q803?
Check Q802, Q803.
Yes
Does proper DC B8V
appear at IC109?
Check IC109.
1
2
3
4
5
No
No
No
Check IC800 and IC400.
Yes
Does proper DC 5V_P
appear
at Pin 2 of IC108?
Check IC108.
Yes
Does proper DC 9V_S
appear at IC110?
Check IC110.
Yes
Yes
Does proper DC B5V
appear at IC120?
Check IC120.
6
7
8
Summary of Contents for LE20S81BX
Page 14: ...7 Block Diagrams 7 1 7 Block Diagram ...
Page 15: ...Memo 7 Block Diagrams 7 2 ...
Page 16: ...13 Circuit Descriptions 13 1 13 Circuit Descriptions 13 1 Overall Block Structure ...
Page 17: ...13 Circuit Descriptions 13 2 13 2 1 MAIN BOARD POWER TREE 13 2 Partial Block Description ...
Page 19: ...13 Circuit Descriptions 13 4 ...
Page 25: ...11 Disassembly and Reassembly 11 6 Memo ...
Page 51: ...Memo 10 Operating Instructions and Installation 10 6 ...
Page 53: ...12 PCB Diagram 12 2 Memo ...
Page 57: ...Memo 1 Precautions 1 4 ...
Page 80: ...4 Troubleshooting 4 3 WAVEFORMS 1 2 5 3 6 4 4 7 8 ...
Page 83: ...4 Troubleshooting 4 6 Memo ...
Page 85: ...8 Wiring Diagrams 8 2 Memo ...